People who don't do what they are asked to do despite various chasers.
On multiple occasions, I sent an email to the resources on my project saying: "Please action XYZ by this date, if you are experiencing any access issues, please let me know asap".
Some people make it a point either a) not to action things or b) not raise a hand if they have any access issues. I had to proactively go into the system and check one by one what has been actioned and who could be experiencing access issues. It's technically not my job to coordinate accesses, as this is to be done between the previous portfolio owners and the new ones. I now find myself having to shoot emails requesting access to the previous portfolio owners on behalf of the new portfolio owners in order to prevent them from saying they couldn't action XYZ because they didn't get access (despite the fact it was their job to coordinate access). I don't mind coordinating the access, but please if I'm asking to let me know if you're having issues, it's the least you can do. Going into the system and checking things one for everyone is incredibly time consuming especially as I'm not the one granting access.
I don't know, maybe I'm a dumbo who doesn't know how to work.